9. shot (n.) a consecutive series of pictures that constitutes a unit of action in a film
The vacuum level is determined by the pressure differential between the evacuated volume and the surrounding atmosphere. Several units of measure can be used. Most refer to the height of a column of mercury â usually inches of mercury (in.-Hg) or millimeters of mercury (mm-Hg).
The performance of a vacuum cleaner can be measured by several parameters: 1  Airflow, in litres per second [l/s] or cubic feet per minute (CFM or ftÂ³/min) 2  Air speed, in metres per second [m/s] or miles per hour [mph] 3  Suction, vacuum, or water lift, in pascals [Pa] or inches of water.